From patchwork Thu Apr 8 18:28:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12192123 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA040C433B4 for ; Thu, 8 Apr 2021 18:30:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CABF2610FC for ; Thu, 8 Apr 2021 18:30:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232778AbhDHSai (ORCPT ); Thu, 8 Apr 2021 14:30:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232850AbhDHSaK (ORCPT ); Thu, 8 Apr 2021 14:30:10 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2857BC0613B9 for ; Thu, 8 Apr 2021 11:29:11 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id f75so2846514yba.8 for ; Thu, 08 Apr 2021 11:29:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=YjeJV8buzrz7V/Fei1ZZdYKcpdw6OH5oq1m6MHRvYmA=; b=v/SKTB1wC3jPizkKDMqxqoKm8JBsnHMb3V89BEumYlVpdhhEiRe+pjAmo6I5FqynU8 BxUQazKPK3vtO2uqCca1Wl5bOyBQK1LOLIgMPfV4qDMLeqTeQREY+HKJ5z2YNFd516IR Uc1OZ9qlz08gx/ejNcytyVZ7xNx8ridbKmiNvCOVYAKSu6nOn62N1AIdYI5g825VAPl/ 0m7DrTs5lzXT9lrzp6nDTNrBPjuzpJda9D3+kWA63RP3IiEUJK5UpPL2ysFDJ6xJmOIg XaA5uPdBZQnoyh1YIcSDB+RQ8R6kYF6Emr4JkBNKiDpsBFkzFogjdZxwtALGSUN2SFKW ndDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=YjeJV8buzrz7V/Fei1ZZdYKcpdw6OH5oq1m6MHRvYmA=; b=HsfWgLbgmtmKx2MfEPvdha3a5zOQuutw+4A9I8S4akuOci5vJBnvAah/Z+/u1Zf+2g qmm6hJIsMSPnBEWjLVhCovBAQ6vVqGsWGhQzf7aQHaXSHgUOfnJ1nNeooJCNfcT06slR z0bNwREOpdCkzHLKQt9nYZ/GJf8mALhnrD1s35QW18slmybgjg7fXi6gJQGk1Fx3noNj vuYRTPT5tHdXtSL1mGsJxxjDHffXlLQLFMEC/WsODIUjhrDJawYI/VF23wLkBiURyF68 5KViVIj0wTDvgW++9c++gGQct+sS/nirzzA+0HHQOWrOQ4qwBI0R6JTti8W5oggdqDXs 2XMw== X-Gm-Message-State: AOAM533IcPTSpYCJxM3atfnrNvlbHTGWtxcYRlcDpXYaOD3s0ZhUNei4 n/2IIt6C6a621nUiOYThV4IlWvWg0ffHxEYheFo= X-Google-Smtp-Source: ABdhPJzm6pdKlFzf5PWHu4bUzusCbWOAn93ewk4Srt7AdZyHa2tCRz8rO0ngS/HvlZRA63qxtBMVoCdOuDKqfxzBxvs= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:3560:8505:40a2:e021]) (user=samitolvanen job=sendgmr) by 2002:a25:a42a:: with SMTP id f39mr13864946ybi.414.1617906550366; Thu, 08 Apr 2021 11:29:10 -0700 (PDT) Date: Thu, 8 Apr 2021 11:28:38 -0700 In-Reply-To: <20210408182843.1754385-1-samitolvanen@google.com> Message-Id: <20210408182843.1754385-14-samitolvanen@google.com> Mime-Version: 1.0 References: <20210408182843.1754385-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.1.295.g9ea45b61b8-goog Subject: [PATCH v6 13/18] arm64: use function_nocfi with __pa_symbol From: Sami Tolvanen To: Kees Cook Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , "Paul E. McKenney" , Christoph Hellwig , Peter Zijlstra , Sedat Dilek , Mark Rutland , Catalin Marinas , bpf@vger.kernel.org, linux-hardening@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org With CONFIG_CFI_CLANG, the compiler replaces function address references with the address of the function's CFI jump table entry. This means that __pa_symbol(function) returns the physical address of the jump table entry, which can lead to address space confusion as the jump table points to the function's virtual address. Therefore, use the function_nocfi() macro to ensure we are always taking the address of the actual function instead. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Acked-by: Mark Rutland Tested-by: Nathan Chancellor --- arch/arm64/include/asm/mmu_context.h | 2 +- arch/arm64/kernel/acpi_parking_protocol.c | 3 ++- arch/arm64/kernel/cpu-reset.h | 2 +- arch/arm64/kernel/cpufeature.c | 2 +- arch/arm64/kernel/psci.c | 3 ++- arch/arm64/kernel/smp_spin_table.c | 3 ++- 6 files changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index bd02e99b1a4c..386b96400a57 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -140,7 +140,7 @@ static inline void cpu_replace_ttbr1(pgd_t *pgdp) ttbr1 |= TTBR_CNP_BIT; } - replace_phys = (void *)__pa_symbol(idmap_cpu_replace_ttbr1); + replace_phys = (void *)__pa_symbol(function_nocfi(idmap_cpu_replace_ttbr1)); cpu_install_idmap(); replace_phys(ttbr1); diff --git a/arch/arm64/kernel/acpi_parking_protocol.c b/arch/arm64/kernel/acpi_parking_protocol.c index e7c941d8340d..bfeeb5319abf 100644 --- a/arch/arm64/kernel/acpi_parking_protocol.c +++ b/arch/arm64/kernel/acpi_parking_protocol.c @@ -99,7 +99,8 @@ static int acpi_parking_protocol_cpu_boot(unsigned int cpu) * that read this address need to convert this address to the * Boot-Loader's endianness before jumping. */ - writeq_relaxed(__pa_symbol(secondary_entry), &mailbox->entry_point); + writeq_relaxed(__pa_symbol(function_nocfi(secondary_entry)), + &mailbox->entry_point); writel_relaxed(cpu_entry->gic_cpu_id, &mailbox->cpu_id); arch_send_wakeup_ipi_mask(cpumask_of(cpu)); diff --git a/arch/arm64/kernel/cpu-reset.h b/arch/arm64/kernel/cpu-reset.h index ed50e9587ad8..f3adc574f969 100644 --- a/arch/arm64/kernel/cpu-reset.h +++ b/arch/arm64/kernel/cpu-reset.h @@ -22,7 +22,7 @@ static inline void __noreturn cpu_soft_restart(unsigned long entry, unsigned long el2_switch = !is_kernel_in_hyp_mode() && is_hyp_mode_available(); - restart = (void *)__pa_symbol(__cpu_soft_restart); + restart = (void *)__pa_symbol(function_nocfi(__cpu_soft_restart)); cpu_install_idmap(); restart(el2_switch, entry, arg0, arg1, arg2); diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index e5281e1c8f1d..0b2e0d7b13ec 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1462,7 +1462,7 @@ kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused) if (arm64_use_ng_mappings) return; - remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings); + remap_fn = (void *)__pa_symbol(function_nocfi(idmap_kpti_install_ng_mappings)); cpu_install_idmap(); remap_fn(cpu, num_online_cpus(), __pa_symbol(swapper_pg_dir)); diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c index 62d2bda7adb8..ab7f4c476104 100644 --- a/arch/arm64/kernel/psci.c +++ b/arch/arm64/kernel/psci.c @@ -38,7 +38,8 @@ static int __init cpu_psci_cpu_prepare(unsigned int cpu) static int cpu_psci_cpu_boot(unsigned int cpu) { - int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa_symbol(secondary_entry)); + phys_addr_t pa_secondary_entry = __pa_symbol(function_nocfi(secondary_entry)); + int err = psci_ops.cpu_on(cpu_logical_map(cpu), pa_secondary_entry); if (err) pr_err("failed to boot CPU%d (%d)\n", cpu, err); diff --git a/arch/arm64/kernel/smp_spin_table.c b/arch/arm64/kernel/smp_spin_table.c index 056772c26098..c45a83512805 100644 --- a/arch/arm64/kernel/smp_spin_table.c +++ b/arch/arm64/kernel/smp_spin_table.c @@ -66,6 +66,7 @@ static int smp_spin_table_cpu_init(unsigned int cpu) static int smp_spin_table_cpu_prepare(unsigned int cpu) { __le64 __iomem *release_addr; + phys_addr_t pa_holding_pen = __pa_symbol(function_nocfi(secondary_holding_pen)); if (!cpu_release_addr[cpu]) return -ENODEV; @@ -88,7 +89,7 @@ static int smp_spin_table_cpu_prepare(unsigned int cpu) * boot-loader's endianness before jumping. This is mandated by * the boot protocol. */ - writeq_relaxed(__pa_symbol(secondary_holding_pen), release_addr); + writeq_relaxed(pa_holding_pen, release_addr); __flush_dcache_area((__force void *)release_addr, sizeof(*release_addr));